Periodic horizontal monitor flickering

baekalfen

Honorable
Dec 16, 2013
2
0
10,510
I have in a long time had troubles with horizontal flickering. Maybe because the horizontal clock is temporarily out of sync.
I have searched for ages and can't find an answer. Here is a picture of it:
4owt.jpg

http://imageshack.us/a/img571/2318/4owt.jpg

My PC is disassembled right now, so i can't test with it.
It didn't happen on my desktop PC, but it does with my MacBook Pro. I connect it to my MacBook with a DisplayPort -> VGA adaptor. The PC was connected with DVI directly.
If i set a high resolution (>1080p), it happens more often.